Volume 77, April 2026, 152914Author links open overlay panelYanxia Chen a, Jinlin Liu bShow moreAccess through your organization

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Access through your organizationSection snippetsDear Editor

We read with great interest the recent study by Chang et al. [1] on the development of a prediction model for progression of rheumatoid arthritis-associated interstitial lung disease (RA-ILD) using data from the prospective KORAIL cohort, which is a valuable contribution to the field. However, we have several methodological concerns that may affect the validity and generalizability of the findings.

First, regarding sample size and event per variable (EPV) considerations, established statistical

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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